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Kleptoparasitism and Scavenging Can Stabilize Ecosystem Dynamics.
The American Naturalist
|August 23, 2017
Summary
Scavenging by wild boar stabilizes wolf-prey dynamics in Italy, but too much sharing causes ecosystem collapse. This highlights the importance of scavenging in food web modeling.
Area of Science:
- Ecology
- Wildlife Biology
- Food Web Dynamics
Background:
- Scavenging is a common ecological process, yet its role in complex food webs is understudied.
- Predator-prey dynamics and interspecific competition are key factors in ecosystem stability.
Purpose of the Study:
- To investigate the impact of scavenging on predator-prey dynamics in a northern Apennine ecosystem.
- To model the multitrophic interactions between wolves, wild boar, deer, and vegetation.
Main Methods:
- Camera traps were used to observe wolf kills and scavenging behavior.
- A deterministic, multitrophic web model was developed to simulate ecosystem dynamics.
Main Results:
- Wild boar successfully compete with wolves for carcasses, unlike in North American systems.
- Scavenging stabilizes the food web above a certain threshold, increasing both deer and wild boar populations.
- Excessive scavenging leads to the collapse of the wolf and wild boar populations.
Conclusions:
- Scavenging plays a critical role in the stability and dynamics of this ecosystem.
- Wild boar's exploitation of wolf kills enhances their populations, potentially increasing their invasiveness.
- Food web models must incorporate scavenging to accurately represent ecosystem functioning.
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